October weather forecast
Surabaya, Indonesia

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The skyscrapers making the cityscape of Surabaya in East Java, Indonesia
The skyscrapers making the cityscape of Surabaya in East Java, Indonesia

Weather in October

October in Surabaya introduces a slow yet perceptible transition towards the wet season as rainfall gradually increases on the city's vista. The weather remains on the warmer side, but the rising sea temperatures and cloud cover indicate a change in the season. A notable feature of October's weather is the consistent wind speeds that influence the temperatures subtly. Sunshine hours start to reduce, signaling shorter days. As October progresses, the dawn of the rain season is seen through the increasing number and intensity of rainy days.

Temperature

October is the warmest month, exhibiting average temperatures of 32.9°C at the peak and 26.4°C at the base.

Heat index

The heat index value for October is estimated at a blisteringly hot 40°C. Extra safeguards are necessary to prevent heat exhaustion and heat cramps. Prolonged activity might cause heatstroke.
It is noted that heat index values are ascertained for locations in the shade and with gentle breezes. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', comes about by integrating the temperature readings with the humidity levels. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are extremely significant for children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
When temperatures rise, the human body turns to perspiration, using the cooling power of evaporating sweat. When the level of relative humidity is elevated, evaporation diminishes, causing more warmth to be retained in the body than in dry air. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.

Humidity

With an average relative humidity of 63%, October is the least humid month in Surabaya.

Rainfall

In Surabaya, in October, during 7.6 rainfall days, 14mm of precipitation is typically accumulated. Throughout the year, in Surabaya, there are 187.8 rainfall days, and 839mm of precipitation is accumulated.

Sea temperature

In Surabaya, in October, the average water temperature is 28.9°C.
Note: In water temperatures ranging between 25°C and 29°C, activities such as swimming and diving become highly pleasurable for long durations.

Daylight

The average length of the day in October is 12h and 16min.
On the first day of October, sunrise is at 05:13 and sunset at 17:23. On the last day of the month, sunrise is at 05:01 and sunset at 17:23 WIB.

Sunshine

August through October, with an average of 9.9h of sunshine, are months with the most sunshine in Surabaya.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: In October, the maximum UV index of 7 suggests these recommendations:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Warning! The Sun's UV rays intensify with reflections from sand and water.
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FAQ

What are the warmest months in Surabaya?

Surabaya's warmest month, October, generally records average temperatures ranging from a high of 32.9°C to a low of 26.4°C.

How hot is it in Surabaya in October?

The average high-temperature and low-temperature in Surabaya during October are 32.9°C and 26.4°C respectively. The average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines air temperature and relative humidity, in October is estimated at 40°C.

What is the least humid month in Surabaya?

With an average relative humidity of 63%, October is the least humid month.

What is the average humidity in October in Surabaya?

In Surabaya, Indonesia, the average relative humidity in October is 63%.

How many days does it rain in October in Surabaya?

In October, the rain falls for 7.6 days. Throughout October, 14mm of precipitation is accumulated.

What is the water temperature in October in Surabaya?

In October, the average sea temperature in Surabaya is 28.9°C. For swimming, diving, and other water activities, temperatures between 25°C and 29°C are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

How many hours of daylight does Surabaya have in October?

The average day length in October is 12h and 16min.

When is the sunrise / sunset in October in Surabaya?

On the first day of October in Surabaya, sunrise is at 05:13 and sunset at 17:23. On the last day of the month, sunrise is at 05:01 and sunset at 17:23 WIB.

What is the month with the most sunshine in Surabaya?

The months with the most sunshine are August through October, with an average of 9.9h of sunshine.

How many hours of sunshine does Surabaya have in October?

In Surabaya, the average sunshine duration in October is 9.9h.

What are the months with the highest UV index in Surabaya?

January through December, with an average maximum UV index of 7, are months with the highest UV index in Surabaya, Indonesia.

When is the lowest UV index in Surabaya?

January through December, with an average maximum UV index of 7, are months with the lowest UV index in Surabaya, Indonesia.

How high is the UV index in October in Surabaya?

The average daily maximum UV index in October in Surabaya is 7. A UV Index of 6 to 7 symbolizes a high health risk from exposure to Sun's UV rays.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average sea temperature
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in October
Surabaya, Indonesia

Average temperature in October - Surabaya, Indonesia
  • Average high temperature in October: 32.9°C

The warmest month (with the highest average high temperature) is October (32.9°C).
The months with the lowest average high temperature are January, February and July (30.1°C).

  • Average low temperature in October: 26.4°C

The month with the highest average low temperature is November (26.5°C).
The coldest month (with the lowest average low temperature) is August (24.2°C).

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Average pressure in October
Surabaya, Indonesia

Average pressure in October - Surabaya, Indonesia
  • Average pressure in October: 1010.5mbar

The month with the highest atmospheric pressure is August (1011.4mbar).
The month with the lowest atmospheric pressure is December (1008.7mbar).

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Average wind speed in October
Surabaya, Indonesia

Average wind speed in October - Surabaya, Indonesia
  • Average wind speed in October: 9.1km/h

The windiest month (with the highest average wind speed) is August (9.9km/h).
The calmest month (with the lowest average wind speed) is April (6.3km/h).

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Average humidity in October
Surabaya, Indonesia

Average humidity in October - Surabaya, Indonesia
  • Average humidity in October: 63%

The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is October (63%).

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Average rainfall in October
Surabaya, Indonesia

Average rainfall in October - Surabaya, Indonesia
  • Average rainfall in October: 14mm

The wettest month (with the highest rainfall) is February (179mm).
The driest month (with the least rainfall) is August (4mm).

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Average rainfall days in October
Surabaya, Indonesia

Average rainfall days in October - Surabaya, Indonesia
  • Average rainfall days in October: 7.6 days

The month with the highest number of rainy days is January (27 days).
The month with the least rainy days is August (3.7 days).

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Average sea temperature in October
Surabaya, Indonesia

Average sea temperature in October - Surabaya, Indonesia
  • Average sea temperature in October: 28.9°C

The best month for swimming (with the highest average sea temperature) is December (30.2°C).
The coldest month (with the lowest average sea temperature) is August (27.8°C).

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Average daylight in October /
Average sunshine in October
Surabaya, Indonesia

Average daylight in October / Average sunshine in October - Surabaya, Indonesia
  • Average daylight in October: 12h and 2min

The month with the longest days is December (Average daylight: 12h and 30min).
The month with the shortest days is June (Average daylight: 11h and 42min).

  • Average sunshine in October: 9h and 5min

The months with the most sunshine are August, September and October (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 8h and 6min).

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Average sunshine days in October
Surabaya, Indonesia

Average sunshine days in October - Surabaya, Indonesia
  • Average sunshine days in October: 19.9 days

The month with the most sunshine days is August (26 days).
The month with the least sunshine days is February (2.8 days).

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Average UV index in October
Surabaya, Indonesia

Average UV index in October - Surabaya, Indonesia
  • Average UV index in October: 7

The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).

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Average cloud cover in October
Surabaya, Indonesia

Average cloud cover in October - Surabaya, Indonesia
  • Average cloud cover in October: 14

The month with the most cloud cover is January (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 11).

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Average visibility in October
Surabaya, Indonesia

Average visibility in October - Surabaya, Indonesia
  • Average visibility in October: 10km

The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January and February (9km).

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Surabaya, Indonesia

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